Hi @Beyza Korkmaz,
Is this still an issue for you? The IBM SPSS Statistics Digital application tethers itself to IBMid and static properties of the PC where it is installed. There have been rare instances where one of these static properties has not been unique. In such a rare instance, you might see this error message by mistake. The best thing to do in such a case will be to log a licensing case with IBM SPSS Support.
See How to open a Licensing Case